Green is cheerful, friendly, determined, and energetic; additionally, she is also a powerful, focused Trainer that is respectful to her opponents. However, she also has a dark side: she is heavily implied to have an obsession with Mewtwo, even getting jealous when she finds out that the user has already caught the Pokémon by the time they meet her. Green asks the player character if they want to become "one of her Pokémon" together with Mewtwo after she is beaten in battles.